<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>vue-router</title>

  <script src="https://unpkg.com/vue/dist/vue.js"></script>
  <style>
  body{
      font-family:"Segoe UI";
    }
    li{
      list-style:none;
    }
    a{
      text-decoration:none;
    }
    .pagination {
        position: relative;

      }
      .pagination li{
        display: inline-block;
        margin:0 5px;
      }
      .pagination li a{
        padding:.5rem 1rem;
        display:inline-block;
        border:1px solid #ddd;
        background:#fff;

        color:#0E90D2;
      }
      .pagination li a:hover{
        background:#eee;
      }
      .pagination li.active a{
        background:#0E90D2;
        color:#fff;
      }
  </style>
</head>
<body>
    <script type="text/x-template" id="page">
        <ul class="pagination" >
            <li v-show="current != 1" @click="current-- && goto(current)" ><a href="#">上一页</a></li>
            <li v-for="index in pages" @click="goto(index)" :class="{'active':current == index}" :key="index">
              <a href="#" >{{index}}</a>
            </li>
            <li v-show="allpage != current && allpage != 0 " @click="current++ && goto(current++)"><a href="#" >下一页</a></li>
        </ul>
    </script>
    <div id="page_all">
          <page></page>
    </div>





<script>

  Vue.component("page",{
      template:"#page",
        data:function(){
          return{
            current:1,
            showItem:5,
            allpage:20
          }
        },
        computed:{
          pages:function(){
                var pag = [];
                  if( this.current < this.showItem ){ //如果当前的激活的项 小于要显示的条数
                       //总页数和要显示的条数那个大就显示多少条
                       var i = Math.min(this.showItem,this.allpage);
                       while(i){
                           pag.unshift(i--);
                       }
                   }else{ //当前页数大于显示页数了
                       var middle = this.current - Math.floor(this.showItem / 2 ),//从哪里开始
                           i = this.showItem;
                       if( middle >  (this.allpage - this.showItem)  ){
                           middle = (this.allpage - this.showItem) + 1
                       }
                       while(i--){
                           pag.push( middle++ );
                       }
                   }
                 return pag
               }
      },
      methods:{
        goto:function(index){
          if(index == this.current) return;
            this.current = index;
            //这里可以发送ajax请求
            console.log(index);
        }
      }
    })

var vm = new Vue({
  el:'#page_all',
})



</script>
</body>
</html>
